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    <title>markdown-r-online</title>
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      tex2jax: {
        //-<!--$表示行内元素，$$表示块状元素 -->
        inlineMath: [ ['$','$'], ["\\\(","\\)"] ],
        displayMath: [ ['$$','$$'], ["\\\[","\\]"] ],
        processEscapes: true
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      "HTML-CSS": {
        availableFonts: ["STIX","TeX"] ,
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      CommonHTML: { scale: 100 }
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